Many modern models equipped with Electronic Fuel Injection (EFI), Electronic Control Units (ECU), or Vanguard EFI systems can display diagnostic trouble codes (DTCs) when a fault is detected.
These error codes help identify electrical, fuel, ignition, sensor, or engine management problems.
Briggs and Stratton Engine Error Codes
Fuel System Error Codes
| Error Code | Description | Possible Causes | Recommended Solution |
|---|---|---|---|
| P0087 | Fuel Rail Pressure Too Low | Weak fuel pump, clogged fuel filter, fuel leak | Inspect pump, replace filter, check fuel pressure |
| P0088 | Fuel Rail Pressure Too High | Faulty pressure regulator, blocked return line | Inspect regulator and fuel lines |
| P0090 | Fuel Pressure Regulator Circuit Fault | Wiring issue, faulty regulator | Repair wiring or replace regulator |
| P0093 | Large Fuel Leak Detected | Damaged fuel hose, leaking injector | Inspect and repair fuel leaks |
| P0171 | System Too Lean | Vacuum leak, clogged injector, dirty fuel filter | Clean injector, replace filter |
| P0172 | System Too Rich | Faulty injector, bad fuel pressure regulator | Check injector operation |
| P0190 | Fuel Rail Pressure Sensor Circuit | Faulty sensor or wiring | Test sensor and repair circuit |
| P0191 | Fuel Rail Pressure Range Performance | Inconsistent fuel pressure | Check pump and sensor |
| P0201 | Injector Circuit Cylinder 1 | Bad injector, damaged connector | Test injector resistance |
| P0202 | Injector Circuit Cylinder 2 | Wiring issue or failed injector | Replace faulty injector |
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Ignition System Error Codes
| Error Code | Description | Possible Causes | Recommended Solution |
|---|---|---|---|
| P0300 | Random Misfire Detected | Fuel issue, ignition problem | Inspect spark plugs and fuel system |
| P0301 | Cylinder 1 Misfire | Worn spark plug, ignition coil | Replace plug or coil |
| P0302 | Cylinder 2 Misfire | Coil failure, low compression | Test compression and ignition |
| P0315 | Crankshaft Position Variation Not Learned | ECU reset | Perform relearn procedure |
| P0335 | Crankshaft Position Sensor Circuit | Failed crank sensor | Replace sensor |
| P0336 | Crankshaft Sensor Performance | Loose sensor, damaged reluctor | Inspect mounting |
| P0340 | Camshaft Position Sensor Circuit | Failed sensor | Replace sensor |
| P0341 | Camshaft Position Sensor Range | Timing issue | Inspect timing components |
| P0351 | Ignition Coil A Primary Circuit | Bad ignition coil | Replace ignition coil |
| P0352 | Ignition Coil B Primary Circuit | Coil wiring fault | Repair wiring |
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Sensor Error Codes
| Error Code | Description | Possible Causes | Recommended Solution |
|---|---|---|---|
| P0105 | MAP Sensor Circuit | Failed MAP sensor | Replace MAP sensor |
| P0106 | MAP Sensor Range Performance | Dirty sensor | Clean or replace sensor |
| P0107 | MAP Sensor Low Voltage | Short to ground | Repair wiring |
| P0108 | MAP Sensor High Voltage | Open circuit | Inspect wiring harness |
| P0112 | Intake Air Temperature Sensor Low | Shorted sensor | Replace sensor |
| P0113 | Intake Air Temperature Sensor High | Open sensor circuit | Repair wiring |
| P0117 | Engine Coolant Temperature Low Input | Faulty temperature sensor | Replace sensor |
| P0118 | Engine Coolant Temperature High Input | Wiring issue | Inspect connector |
| P0122 | Throttle Position Sensor Low | TPS failure | Replace TPS |
| P0123 | Throttle Position Sensor High | Wiring fault | Repair harness |
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Oxygen Sensor Error Codes
| Error Code | Description | Possible Causes | Recommended Solution |
|---|---|---|---|
| P0130 | Oxygen Sensor Circuit Bank 1 | Failed O2 sensor | Replace sensor |
| P0131 | O2 Sensor Low Voltage | Lean mixture | Check fuel system |
| P0132 | O2 Sensor High Voltage | Rich mixture | Inspect injector |
| P0133 | O2 Sensor Slow Response | Aging sensor | Replace O2 sensor |
| P0135 | O2 Sensor Heater Circuit | Heater failure | Replace sensor |
| P0141 | O2 Heater Circuit Bank 1 | Wiring fault | Repair wiring |
Charging System Error Codes
| Error Code | Description | Possible Causes | Recommended Solution |
|---|---|---|---|
| P0560 | System Voltage Fault | Weak battery | Charge or replace battery |
| P0562 | Low System Voltage | Failing alternator, battery | Test charging system |
| P0563 | High System Voltage | Faulty regulator | Replace voltage regulator |
| P0620 | Generator Control Circuit | Charging system issue | Inspect stator and regulator |
| P0622 | Generator Field Control Circuit | Wiring damage | Repair circuit |
| P2503 | Charging Voltage Low | Weak stator | Test charging output |
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Throttle and Air Intake Error Codes
| Error Code | Description | Possible Causes | Recommended Solution |
|---|---|---|---|
| P0505 | Idle Control System Malfunction | Dirty throttle body | Clean throttle body |
| P0506 | Idle RPM Lower Than Expected | Air restriction | Clean air filter |
| P0507 | Idle RPM Higher Than Expected | Vacuum leak | Inspect intake gasket |
| P1516 | Electronic Throttle Control Fault | Faulty throttle actuator | Replace actuator |
| P2101 | Throttle Actuator Performance | Carbon buildup | Clean throttle body |
| P2119 | Throttle Closed Position Performance | TPS issue | Replace TPS |
ECU Communication Error Codes
| Error Code | Description | Possible Causes | Recommended Solution |
|---|---|---|---|
| U0100 | Lost Communication With ECM | Loose connector | Inspect ECU wiring |
| U0101 | Lost Communication With TCM | CAN communication fault | Repair CAN wiring |
| U0140 | Lost Communication With Body Control Module | Electrical issue | Inspect connectors |
| U0155 | Lost Communication With Dashboard | Display wiring problem | Check display harness |
| U1000 | CAN Bus Communication Failure | Wiring short | Diagnose CAN network |
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Engine Protection Error Codes
| Error Code | Description | Possible Causes | Recommended Solution |
|---|---|---|---|
| P0217 | Engine Overtemperature | Cooling issue | Clean cooling fins |
| P0230 | Fuel Pump Primary Circuit | Failed relay | Replace relay |
| P0231 | Fuel Pump Low Voltage | Weak battery | Charge battery |
| P0232 | Fuel Pump High Voltage | Wiring short | Repair wiring |
| P0606 | Internal ECU Processor Fault | Failed ECU | Replace ECU |
| P1603 | ECU Internal Error | Software corruption | Reprogram or replace ECU |
| P1682 | Ignition Voltage Fault | Poor electrical connection | Inspect ignition switch |
Governor and Speed Control Error Codes
| Error Code | Description | Possible Causes | Recommended Solution |
|---|---|---|---|
| P1500 | Governor Speed Error | Misadjusted governor | Adjust governor linkage |
| P1501 | Governor Overspeed | Governor spring issue | Replace spring |
| P1502 | Governor Underspeed | Fuel restriction | Inspect fuel delivery |
| P1510 | Throttle Position Fault | TPS issue | Test and replace TPS |
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How to Read Briggs & Stratton Error Codes
Most Briggs & Stratton EFI engines require a compatible diagnostic scanner or the manufacturer’s diagnostic software to retrieve stored trouble codes. Some Vanguard EFI engines also allow technicians to view active and stored codes using the engine’s diagnostic interface.
Before replacing any components:
- Record all active and stored codes.
- Clear the codes after repairs.
- Run the engine through a complete operating cycle.
- Verify that the code does not return.
- Inspect wiring and connectors before replacing expensive sensors or the ECU.
Many fault codes result from loose electrical connectors, weak batteries, corroded terminals, or damaged wiring rather than failed components.
Common Causes of Briggs & Stratton Error Codes
Several issues account for most engine fault codes:
- Dirty or contaminated fuel
- Clogged fuel filters
- Weak battery voltage
- Corroded electrical connectors
- Damaged wiring harnesses
- Failed ignition coils
- Worn spark plugs
- Dirty throttle body
- Vacuum leaks
- Faulty sensors
- Poor engine grounding
- ECU communication failures
Routine maintenance, including replacing air filters, fuel filters, spark plugs, and engine oil according to the manufacturer’s service schedule, significantly reduces the likelihood of diagnostic trouble codes and helps maintain reliable engine performance.
